Von Miller’s potential four-game suspension for violating the league’s drug policy, which surfaced this week and rocked a Broncos team that is a favorite to reach the Super Bowl, wasn’t related to a failed drug test, according to reports.

Von Miller has been involved in the NFL's substance-abuse program since testing positive for marijuana in 2011. (AP Photo)

Miller is appealing the suspension and says he “did nothing wrong.” If the new reports are accurate, it’s unclear why Miller would receive a four-game suspension.

USA Today reported the suspension could have been triggered by missing a drug test or providing a diluted urine sample.

NFL.com said the ban could have resulted from skipping a counseling session or for repeatedly being late for tests. Miller has been involved in the NFL's substance-abuse program since testing positive for marijuana in 2011, his rookie year, after which he was named NFL Defensive Rookie of the Year.

According to an NFL.com report, Miller’s appeal will be heard in mid-August.

Losing Miller for a month would be a blow, but the Broncos’ schedule is favorable during that stretch. The team plays three of its first four games at home—and two of those contests are against opponents (Oakland, Philadelphia) that had poor records last season. The Broncos open the NFL season on Thursday, Sept. 5 at home against the Ravens, followed by a Week 2 game at the Giants.